pub fn new_birthday_probability(n: u32) -> f64 {
    // TODO: 这里写逻辑
    if n > 365 {
        return 1.0f64
    }
    else {
        let mut acc: f64 = 1.0;
        for i in 1..n {
            acc *= (365 - i) as f64 / 365f64
        }
        return 1.0f64 - acc
    }
}
